Rotary valve.



B. $MARTT..

ROTARY VALVE.

I I APPLICATION IILED FEB. 6.1908. A 981,019. l 7 Patented Jan. 10,1911.

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B. SMARTT.

ROTARY VALVE.

APPLICATION rum) FEB-6.1908.

Patented Jan. 10, 1911.

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.i. H W WW /%8 a i T7 W W UNITED STATES PATENT OFFICE.

BRINAY SMAR'IT, or NASHVILLE, TENNESSEE, Assrenoia To 'rnoivmsivmnmnsrnenn,

or NASHVILLE, TENNESSEE.

ROTARY v'ALvE.

Specification of Letters Patent. Patentd J an. 10, 1911.

Application filed February 6,- 1908, Serial No. 414,633.

To all whom it may concern:

Be it known that I, BRINAY SMARTT, a citizen of the United States,residing at Nashville, in the county of Davidson and State of Tennessee,have invented certain new and useful Improvements in Rotary Valves; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to an improvement in reversing valves, adapted foruse in any of the various types of reciprocating fluid pressure engines.

The object of my invention is to provide an improved form of rotary,reversing valve, possessing simplicity of construction, and, at once,durability and efiiciency of operation.

with these objects in view, my invention comprises the arrangement andcombination of parts hereinafter fully described, and pointed out in theclaim hereto appended.

In the drawings, which form a part of this specification, and which areto be read in conjunction therewith, Figure 1 is a longitudinal section,partly in elevation, of my rotary reversing valve applied to areciprocating single piston steam engine, and with the slide-valve, andreversing valve, both in first position. Fig. 2 is a view, inperspective, of the slide-valve. Fig. 3 is a sectional diagrammaticview, showing the reversing valve in first position, and the slide-valvein second position. Fig. 3 is a sectional diagrammatic view, showing thereversing valve in second position, and the slide-valve in firstposition. matic view, showing the reversing valve and slide-valve bothin second. position. Fig. 4 is a detail view, in perspective, of thereversing valve, and Fig. 5 is a detail view, inperspective, of aport-ion of the valve gear.

Referring more particularly to the drawings, in which like referencecharacters refer to corresponding parts in the several views,

A is the steam'chest, containing the slidevalve a and B is thereversing-valve chamber. The slide-valve a is provided with verticalports and has passages formed on its under side, surrounding the ports,so as to permit passage of steam from either end Fig. 3 is a sectionaldiagramof the cylinder to the exhaust port, as will appear more fullyhereinafter.

Between the steam chest A and the reversing-valve chamber 13' is a platea, provided with ports (1 ,0 a a, and a, for a purpose tobe explainedhereinafter, the latter port a", serving to communicate with an exhaustchamber a.

D is the engine cylinder, containing the piston (5 and piston-rod 03*,which is suitably connected to a cross-head E. The cross-head E isslidably supported on a post 6, and has pivotal connection with aconnecting-rod 6 which, in turn, is pivoted to a drivingwheel 6 Thesteam valve (1, is secured to valvestem a", connected at its outer endwith a depending rod a which is pivotally supported on the bracket a.Carried by the cross-head E is a guiding-sleeve 6 through which the roda passes.

C, O are the reversing valves, in the form of hollow cylinders, workingin the cylindrical casings c and 0 respectively. The casings 0 and 0have ports g, and 9 at the bottom, and h, H, and 70, M at the top. Thevalves C, C are provided with enlarged ports m, m at the bottom, adaptedto register with the ports g, 9 The valve C is further provided withports a, a at its top, to register with ports h, 70, while valve C has asingle port 0 at its top, for registry with either of ports is, 70 Thevalves C, G carry, each, an arm 0 pivoted to a link 0 which extendsthrough the wall of the chamber B, and is pivoted to a suitablyfulorumed lever 0 under control of the operator.

The operation of my invention is as follows: Supposing the parts to bein the position indicated in Fig. 1, steam enters through ports a h, a,m, and 9, moving the piston forward, and causing steam to exhaustthrough ports 9 m 0, 10 a a, into steam outlet a As the piston movesforward, the slide-valve a is moved in the opposite direc tion, so as touncover port a and cover port a thereby reversing the movement of thelive and exhaust steam just described. To reverse movement of the enginelever c is shifted to rock the valves C, so as to open ports h and is,and close ports h and Is as shown in Figs. 3 and 3 Thereupon,

for the first position of the slide-valve, steam enters through 72 andexhausts through h and for the second-position of the slide valve, steamenters through h and exhausts through 74.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters-Patent, is;

In a reversing-valve mechanism, the combination with a steam-chest, of areciprocating valve therein, pairs of ports leadin from the steam-chest,and controlled by sai valve, a reversing-valve-box arranged below thesteam-chest, a pair of hollow rotary valves arranged in said valve-box,a port in the bottom of each of said valves, single ports in thevalve-box communicating with the last-mentioned ports, pairs of ports inthe top of the valve box and leading from the ports in the steam-chestto said rotary valves, a single port in the top of one of said rotaryvalves for registering with either port of the respective pair, a air ofports in the top of the other rotary valve for registering respectivelywith the ports in the other pair, and instrumentalities for operatingsaid rotary valves in unison.

In testimony whereof, I afiix my signature, in the presence of twosubscribing witnesses.

BRINAY SMARTT. Witnesses WM. E. STEGER, LITTQN HICKMAN.

